Azure WebJob：BlobTrigger与QueueTrigger资源使用情况

Question

I created a WebJob project to backup images from Azure to Amazon that used the BlobTrigger attribute for the first parameter in the method

    public static async Task CopyImage([BlobTrigger("images/{name}")] ICloudBlob image, string name, TextWriter log)
    {
        var imageStream = new MemoryStream();
        image.DownloadToStream(imageStream);
        await S3ImageBackupContext.UploadImageAsync(name, imageStream);
    }

Then I read that the BlobTrigger is based on the best effort basis in the document How to use Azure blob storage and changed it to a QueueTrigger.

Both works perfectly fine :-) so it's not a problem but a question. Since I deployed the change the CPU and Memory usage of the WebJob looks like

Can somebody explain me the reason for the drop of memory and CPU usage? Also the data egress went down.

Answer 1

Very interesting.

I think you're the only one who can answer that question.

Do a remote profile for both blob and queue versions, see which method eats up that CPU time:
https://azure.microsoft.com/en-us/blog/remote-profiling-support-in-azure-app-service/

For memory consumption you probably need to grab a memory dump:
https://blogs.msdn.microsoft.com/waws/2015/07/01/create-a-memory-dump-for-your-slow-performing-web-app/